Portable drill press



y 1950 A. P. KJERULFF 2,508,402

PORTABLE DRILL PRESS Filed Nov. 7, 1946 IN VEN TOR.

Patented May 23, 1950 UNITED STATES PATENT OFFICE 2,508,402 PORTABLEDRILL PRESS;

Anton P. Kjrulff, Lake Charles, Ila); Application November 7, 1946,Serial No. 708,218

2' Claims.

I have devised an improved tool for hand use in drilling and pressingoperations which, being portable, is especially useful to mechanics,such as members of the plumbers trade, and others who frequently find itnecessary to perform work, such as repairs of various kinds, at pointsdistant from their work shop where access may be had to heavy stationarypower driven machines.

My invention has for its object to provide a drilling press in which theparts are compact, yet of a size to hold work pieces such as waterfaucet stems and the like, comprising a frame having upper and lowerspaced arms, the former carrying the tool holder and its feed screwwhile the latter serves as the support or bed to which the work piece isclamped.

In conjunction with a tool of the above de-- scribed characteristics myinvention also comprehends a novel construction of the work piece bedand holder therefor, together with an improved mounting for the parts bywhich the rotatable tool is adjustable and fed with relation to the workpiece.

To these and other endsv my invention comprehends further improvementsand arrangements of parts all as will be fully described in theaccompanying specification, the novel features thereof being set forthin the appended claims.

In the drawings: 7

Figure 1 is a side elevation of a, portable'drill press embodying myinvention.

Figure 2 is a front elevation thereof.

Figure 3 is a top plan view.

Figure 4 is a bottom plan view.

Figure 5 is a bottom plan view of the tool chuck.

Figure 6 is a detail of the tool rotating handle and the adjacent end ofthe feed screw therefor illustrating the manner of locking said partstogether for performing certain operations.

Figure 7 is a side elevation showing a modified form of work clamp, and,

Figure 8 is a top plan view of the clamping plate shown in Fig. '7.

Similar reference characters in the several figures indicate similarparts.

My description of a portable tool embodying my invention begins with theframe piece, indicated generally by I, which is U-shape to provideparallel upper and lower arms =2 and 3 which are rectangular in crosssection and are stiffened against springing under pressure by areinforcing rib 4, which is disposed centrally lo formed is a clampingscrew 6 by means of which they may be drawn together, said screw beingprovided with an operating handle in the form of a cross bar I.

The tool carrier mounted on the frame arm 5 2 comprises in part a sleeve8 which fits the opening 5 in said arm and being clamped therein may beadjusted relatively to the arm 3 of the framepiece. The upper half ofsleeve 8 is threaded to receive a tool feeding member 9, the upper endof which projects beyond the sleeve and is provided with a head orannular enlargement I0 having a knurled edge for convenience in rotatingthe member 9 to advance or retract it in the sleeve 8. Member 9 istubular and journaled therein is the drill shaft or Spindle ll having ahandle l2 for rotating it, which is secured to the shaft by a cross pin13. The shaft i prevented from longitudinal movement in the feed memberby providing it with a collar l4 bearing against a friction reducingwasher l5, which in turn bears against the lower end of member 9 and theplacement of a similar washer l6 between the handle I2 and the top ofsaid member. The extended lower end ofthe drill shaft is threaded asindicated at H, and carries a tool chuck, the sleeve 18 of which fitswithin and is guided by the lower end of the sleeve 8'. This chuck maybe of the well known construction, comprising three jaws for gripping atool, such 4 0 as a drill, indicatedby l9; upon which the jaws close byrotation of a nut 20.

From the above described assembly of parts it will be seen that thepoint of a tool secured in the chuck may be brought into engagement witha work piece supported on the arms 3 in the first instance by thevertical adjustment of sleeve 8 and subsequently advanced or retractedby rotation of the feed member, the cutting or drilling action of thetool resulting from its rotation by the handle II.

In instances where parts of a work-piece are to be separated bypressure, a steel pin is secured in the chuck and forward movement isapplied thereto by the rotation of the feed screw. In-

around the rear side of the frame. The latter I asmuch as more power maybe required than it is possible to apply by a persons fingers to theknurled head I0, I provide a simple means for looking it to the handlel2, whereby said parts may be operated conjointly as a unit. To this endthe handle l2 and the head I are each provided with apertures 25, asshown in Fig. '1, which may be brought into register to receive lockingpins 26, as shown in Fig. 6.

V The arm 3 of the frame comprises the work bed or holder and forpurposes of general serviceability I' adapt it to receive a variety ofwork clamps for holding work pieces lying thereon or which on account oftheir shape may re quire them to extend through the bed. To these" endsI also bifurcate the arm 3 by providingit with a slot 21 and enlargethis opening at its outer end, as indicated at 28; to about the diameter of the chuck sleeve l8. v I

In Fig. 4 I have shown a generally useful form of work clamp adapted tohold valve or faucet stems. It comprises two arms 29, 30 havingoverlapping rear ends connected by a rule joint, the latter being formedby perforating said ends and inserting therein a'tubular bushing 3| (seeFig; .1), the extremities of. which are expanded to permanently unitethe arms. .This bushing carries a bolt: 32i having a square head 33which fits the undercut guide 34 of slot 21. A wing nut 35 on the boltserves to tighten it and hold the clamp in the desired position ofadjustment on the work bed. The outer ends of the jaws 29, 3B, carry aclampihgbolt 35 and between the latter and the rule joint Iprovidetheinner faces of said arms with two jawportions of differentdiameters as indicated by 36, 31, the edges of which are serrated, asshown in Fig. 4.

When it is desired to operate: on a work-piece which requires holding itin a; horizontal posi--' tion, a clamping plate 40: such. as shown inFig. 7,2 is employed, This'is a flat plate bent down at its rear end 4tand perforated to receive a clamp-' ing" bolt 42. The forward end of theplate is provided with a slot .43, to accommodate the tool carriediinthe chuck l8, and uponits lower face, adjacent the inner end of theslot, there is provided a V shaped notch 44, which facilitates theclamping of a cylind'rical Work piece, such as indicated by 45 inFigi'i'.

It will be seen from the foregoing description and theacc'ompanyingillustrations that I have provided a tool. for emergency operations,such as: repairing valves; and work of a like: nature which may he-performed by a mechanic; at, the site of the work. Its: general shapeandthe come 7 pactness of the parts rendersit as an acceptable adiunct:to a mechanicswork ,I-claim:

1'. A portable hand-operated drill press comprising, a frame or a sizeto be conveniently grasped in a workmans hand, having upper and kit.

lower parallel arms, the upper arm being bifurcated and having anaperture for a tool operat- 7 ing mechanism and provided with a clampingscrew for drawing said arms together, the lower arm having an upper faceforming a bed for a working piece holder and slotted for theaccommodation of a securing bolt for such holder, said slot beingwidened at the outer end of the arm in alinement with the aperture inthe upper arm, said holder comp'risin'g a pair of arcuate jaws havingoverlapping rear ends'connected by .a rule joint, a clamping boltconnecting the forward ends of said jaws for holding a working piece invertical position, a sleeve adjustably secured in said aperture of theupper arm, a tubular feed screw in the sleeve and a tool spindlejournaled in the sleeve.

2 A. portable hand-operated drill press comprising a frame of a size tobe conveniently grasped in a workmans hand while manipulating the drillpress mechanism carried thereon by his other hand, said frame havingupper and lower bifurcated arms, the upper arm having an aperture for atool operating mechanism and provided with a clamping screw for adjustably receiving such mechanism'in said aperture, the lower arm havingan enlarged opening at its outer extremity centrally alined with theafore said aperture and provided with a slot extending rearwardlytherefrom, a work-piece clamp mounted on the upper face'of the lowerarm,- said clamp comprising'a pair of jaw members having overlappingends pivotally connected by a rule joint, said jaws beingfformed witharcuate inner gripping, edges, aclamping bolt connecting the forwardends of said. jawsand a bolt fitting the slot and cooperating with saidclamp to permit its being adjustably secured relative to the enlargementof the arm, a sleeve adjustably secured in the aperture" of the upperarm, a tubular feed screw threaded in the sleeve having anadjusting headlocated above the screw, a tool spindle journaled in the screw and acrosswise handle secured?- to the outer end" of the spindle 45 beyondvsaid screw head.-

Aivron r. KJERULFF';

REFERENCES GIT-EU UNITED STATES PATENTS Number Name Date ,v

544,402 Crane Aug. 13, 1895 626,474 Ames June-6, 1899 766,713 Loetzer"Aug. 2,1904 1,155,891 Connor Oct. 5, 1915 1,328,111 Asche Jan. 13; 1920

